how to scale imported .obj and .fbx
Select the different parts of the character you want to scale down.
Snap the 3D Cursor to the center of the grid by Pressing ShiftS and selecting Cursor to Center.
We will use the cursor as a pivot point. Use the 3D cursor as the pivot by pressing ..
Scale everything down by pressing S and entering the scale 0.01, press enter to confirm. The objects should be scaled towards the center (0, 0, 0).
Apply rotation and scale by pressing CtrlA and choosing Rotation and Scale.
Align the 3D view pivot point to the current selection by pressing NumpadPeriod.